Insulator.



FRANCIS 'JONES GRANT,

PATENT OFFICE.

OF CHICAGO, ILLINOIS;

INSULATOR.:

No. &33,877.

Spec'ification of Letters Patent.

Patented Oct. 23, 1906.

Application filed Augist 12, 1906. Serial No. 273.897.

To all whom it may concern:

Be it known that I, FRANoIs J ONES GRANT, a subject of the King of England, residng at Chicago, in the'county of Cook and' State of Illinos, have invented new and useful Im- Frovements in Insulators, of which the folowing is a specification.

My invention'is aninsulatorior electric wires; and it consists in certain novel features of construction hereinafter described and claimed. v F

In the accompanying drawings i e, 1` is an elevation of the invention, and Fi z is a central vertical sectional view. Referring specifically to the drawings, the

insulator is in the form of an elbow and is made of glass or other suitable non-conducting material. The vertical arm 5 has a circumferential oove 6 to receive the wire. The horizonta arm 7 has two circumferential ridges 8, and the groove formed by the space between said ridges receives `another wire, so that two wires 'can be supported without the disadvantage of the wires being directly one above the other. The ridges 8 strengthen the glassand also prevent 'water from running into the oove.

At 'the junction of t e arms a recess 9 is made, from which a central opening 10 extends through the arm 7. A screw-bolt 11 extends loosely throu h the opening 10. A. 'disk 12, fittig snugy in the recess 9, is

` placed over the outer end of the openinglO) and this disk has a perforation, as at 13, through which the bolt extends. Between the disk and the bolt-head a Washer 14 is placed. The insulator is fastened to its support or removed `therefrom by applyng a socket-wrench or 'other suitable tool to the head of the bolt, access thereto being' had through the recess 9. The inner end of the arm'7 is formed with sharp notches or teeth 15, which bite into the support when the bolt is screwed home and assist in' holding the insulator in position By making the opening 10 larger than the bolt the latter does not come in contact with the wall of the opening, so that danger of breakage of the insulator from expansion and contraction is avoided. At the junction of the. arms the insulator is beveled, as at 16. The bevel extendsfrom I the front to the rear end of the recess 9, so

that the latter is open at the bottom. This Construction prevents water' from collecting in the recess, so that liability of damage to the insulator from freezing is avoided.

` Having thus described my invention, what is claimed as new, and desred to be Secured by Letters Patent, is-

1. An insulator having arms presented at an angle to each other, each of said arms having a circumferential groove, and oneofsaid arms having alongitudinal opening to receive a support for the insulator, and having 'a recess at the' corner where the arms join, communicating with said opening, the recess being open at the bottom or under side, s'o

In testimony whereof I have signed my name to this specification in the presence of two subscribin witnesses. F ANCIS JONES GRANT.

Witnesses:

WM. J. ROBINSON, SIGNA FELTSKOG. 

